More robust quoting of database identifiers

Note: These aren't database values, those are already using the
appropriate Pyhton DB API method for quoting.

database/postgresql/postgresql_db.py

@@ -124,7 +124,9 @@ class NotSupportedError(Exception):
 #
 
 def set_owner(cursor, db, owner):
-    query = "ALTER DATABASE \"%s\" OWNER TO \"%s\"" % (db, owner)
+    query = "ALTER DATABASE %s OWNER TO %s" % (
+            pg_quote_identifier(db, 'database'),
+            pg_quote_identifier(owner, 'role'))
     cursor.execute(query)
     return True
 
@@ -141,7 +143,7 @@ def get_db_info(cursor, db):
     FROM pg_database JOIN pg_roles ON pg_roles.oid = pg_database.datdba
     WHERE datname = %(db)s
     """
-    cursor.execute(query, {'db':db})
+    cursor.execute(query, {'db': db})
     return cursor.fetchone()
 
 def db_exists(cursor, db):
@@ -151,28 +153,28 @@ def db_exists(cursor, db):
 
 def db_delete(cursor, db):
     if db_exists(cursor, db):
-        query = "DROP DATABASE \"%s\"" % db
+        query = "DROP DATABASE %s" % pg_quote_identifier(db, 'database')
         cursor.execute(query)
         return True
     else:
         return False
 
 def db_create(cursor, db, owner, template, encoding, lc_collate, lc_ctype):
+    params = dict(enc=encoding, collate=lc_collate, ctype=lc_ctype)
     if not db_exists(cursor, db):
+        query_fragments = ['CREATE DATABASE %s' % pg_quote_identifier(db, 'database')]
         if owner:
-            owner = " OWNER \"%s\"" % owner
+            query_fragments.append('OWNER %s' % pg_quote_identifier(owner, 'role'))
         if template:
-            template = " TEMPLATE \"%s\"" % template
+            query_fragments.append('TEMPLATE %s' % pg_quote_identifier(template, 'database'))
         if encoding:
-            encoding = " ENCODING '%s'" % encoding
+            query_fragments.append('ENCODING %(enc)s')
         if lc_collate:
-            lc_collate = " LC_COLLATE '%s'" % lc_collate
+            query_fragments.append('LC_COLLATE %(collate)s')
         if lc_ctype:
-            lc_ctype = " LC_CTYPE '%s'" % lc_ctype
-        query = 'CREATE DATABASE "%s"%s%s%s%s%s' % (db, owner,
-                                                    template, encoding,
-                                                    lc_collate, lc_ctype)
-        cursor.execute(query)
+            query_fragments.append('LC_CTYPE %(ctype)s')
+        query = ' '.join(query_fragments)
+        cursor.execute(query, params)
         return True
     else:
         db_info = get_db_info(cursor, db)
@@ -284,11 +286,17 @@ def main():
             module.exit_json(changed=changed,db=db)
 
         if state == "absent":
-            changed = db_delete(cursor, db)
+            try:
+                changed = db_delete(cursor, db)
+            except SQLParseError, e:
+                module.fail_json(msg=str(e))
 
         elif state == "present":
-            changed = db_create(cursor, db, owner, template, encoding,
+            try:
+                changed = db_create(cursor, db, owner, template, encoding,
                                 lc_collate, lc_ctype)
+            except SQLParseError, e:
+                module.fail_json(msg=str(e))
     except NotSupportedError, e:
         module.fail_json(msg=str(e))
     except Exception, e:
@@ -298,4 +306,6 @@ def main():
 
 # import module snippets
 from ansible.module_utils.basic import *
-main()
+from ansible.module_utils.database import *
+if __name__ == '__main__':
+    main()